The Perils of Penelope - S1-E3
Deliberate mistake: When Thunderbird 2 lands at the Anderbad Train Station, part of Thunderbird 2 catches fire.
Thunderbirds (1964)
1 deliberate mistake in The Perils of Penelope
Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
Revealing mistake: When the dummy plane is shot out of the sky by the fighter pilot, a piece of the plane shoots off into the top left of the screen and bounces off the sky background. (00:23:05)
Terror in New York City - S1-E4
Trivia: When Thunderbird 1 touches down to land in New York City, look at the centre of the screen and you can see a brown building with a giant Swastika on it.